EXHAUST DEVICE HAVING DEFLECTION PLATES
An exhaust device having deflection plates comprises a cabinet that is provided with a space therein. An opening is formed in front of the cabinet. The air-extraction hood located at the top of the cabinet is provided at the bottom thereof with an elongate air-extraction slot facing downwards and parallel to the rear plate. A left deflection plate is vertically located in the space in a manner of being relatively oblique to the left lateral plate while a right deflection plate is vertically located in the space in a manner of being relatively oblique to the right lateral plate. Thereby, the air drawn towards the elongate air-extraction slot can flow into the cabinet via the left and the right deflection plates so as to prevent the leakage of pollutants from the opening in front of the cabinet.
The present invention relates to an exhaust device having deflection plates, and more particularly, to an exhaust device that has deflection plates used for guiding the airflow in the cabinet so as to prevent the leakage of pollutants and is suitable for the cabinets in factories and laboratories and the exhaust cabinets in commercial kitchens.
BACKGROUNDFor performing the function of a conventional exhaust cabinet, a shelter plate with an opening is provided on the upper end of a cabinet, and a flow-guide plate is vertically placed in the rear of the cabinet, where the flow-guide plate is provided with a specially designed opening. Through the opening of the shelter plate and the opening of the flow-guide plate in the rear of the cabinet, harmful gas can be drawn out by using an air-extraction machine and ducts. When the exhaust cabinet is used, the air-extraction machine should be operated correspondingly in order to continue air extraction. During this moment, the door of the cabinet should not be closed completely or an opening should be provided at the doorsill in advance in order to prevent burning of a motor resulting from failing to supply air. Besides, when in use, it is usually necessary to open the door of the cabinet to an approximate height to facilitate operators stretching their hands into the cabinet for experimental operations. However, when the door of the conventional exhaust cabinet is open, based on the principles of Aerodynamics, harmful gas within the cabinet may escape easily around the peripheries of the door. Moreover, the leakage may be even severer when operators are opening or closing the door, or stand in front of the open cabinet for experimental operations, or when there are ambient drafts or there are people walking by. The main reason of the leakage is that vortex and turbulence are easily formed around the peripheries of the cabinet door and around operators' chests. The vortex and turbulence may result in the mass and momentum exchange between the inside and the outside of the cabinet. Therefore, the leakage of the pollutants in the cabinet is scarcely avoidable. Unfortunately, there is nearly no conventional exhaust cabinet can be used without opening and closing its door. In other words, operators can operate their experiments only when the cabinet is open. Besides, the exhaust cabinet is scarcely placed in the environment where there is no ambient air turbulence or there are no people walking by. As a result, in the laboratories, factories, or buildings using the conventional exhaust cabinets, people usually smell the sour odor emitted from chemicals because pollutants continue leaking from the cabinets. Operators and people working thereby may get used to the odor and long-term chemical pollution occurs.
In order to solve the leakage problem resulting from using above conventional exhaust cabinet, an oblique dual air curtain exhaust cabinet has been developed as shown in
According to the structure of the dual air curtain exhaust cabinet, the front and the back sides of the cabinet are respectively formed an open space for operators to perform operations, whereas the left and the right sides thereof are enclosed in order to confine harmful gas therein. In practical use, the two ends of each elongate air blow part (b, b1) should be spaced from the left and right lateral plates (e, e1) in a certain distance (f, f1) so as to supply fresh air in. However, because the left and the right lateral plates (e, e1) are completely enclosed ones, experimental results show that unsteady vortex will appear in the cabinet after the air flows in respectively through the gaps between the two ends of the air blow parts (b, b1) and the left and right lateral plates (e, e1). Consequently, airflow will partially flow out through the two gaps so as to result in the leakage of harmful gas.
In order to overcome above shortcomings, inventor had the motive to study and develop the present invention. After hard research and development, the inventor provides an exhaust device having deflection plates, which is capable of preventing effectively the leakage of pollutants so as to ensure the safety in use.
SUMMARY OF THE DISCLOSUREAn object of the present invention is to provide an exhaust device having deflection plates, where an elongate air-extraction slot is provided on the bottom of the air-extraction hood, and a left and a right deflection plates are provided in the space beneath the cabinet so as to exhaust high-temperature pollutants or soot effectively and prevent the leakage of the pollutants or soot.
Another object of the present invention is to provide an exhaust device having deflection plates, where an elongate air blow part is provided in front of the bottom plate of the cabinet, and a left and right deflection plates are respectively provided in air-supply spaces located at the left and right sides of the elongate air blow slot, so as to confine the airflow inside the cabinet and prevent the leakage of pollutants.
Another object of the present invention is to provide an exhaust device having deflection plates, where a guiding plate is respectively provided at the front ends of the left and right lateral plates, and a guiding part is provided on the bottom of the front plate, so as to let airflow smoothly flow into the cabinet and reduce the size of the backflow area in order to decrease the possibility of pollutants' leakage.
In order to achieve above objects, the present invention provides an exhaust device having deflection plates, comprising a cabinet, a left deflection plate, and a right deflection plate. The cabinet includes an air-extraction hood, a bottom plate, a left lateral plate, a right lateral plate, and a rear plate, all of which define a space. An opening is provided in front of the cabinet. An air-extraction part is provided at the bottom of the air-extraction hood. The air-extraction part has an elongate air-extraction slot facing downwards and the elongate air-extraction slot is parallel to the rear plate. The air-extraction part is connected with an air-extraction machine for drawing air upwards. The left deflection plate is vertically located in the space in a manner of being relatively oblique to the left lateral plate, so as to form a first included angle between the left deflection plate and the left lateral plate. The right deflection plate is symmetrical to the left deflection plate and is vertically located in the space in a manner of being relatively oblique to the right lateral plate, so as to form a second included angle between the right deflection plate and the right lateral plate. Thereby, it is able to guide the airflow in the cabinet and prevent its leakage.
In practice, the front end of the left deflection plate is in a position closely against the right lateral surface of the left lateral plate. The front end of the right deflection plate is in a position closely against the left lateral surface of the right lateral plate. Besides, the first and the second included angles face towards the rear plate.
In practice, a curved first guiding part is provided at the bottom of the front end of the air-extraction hood, while a curved second guiding part is provided at the top of the front end of the bottom plate. Moreover, a curved first guiding plate is provided at the front end of the left lateral plate of the cabinet, while a curved second guiding plate is provided at the front end of the right lateral plate of the cabinet for guiding airflow flowing into the space.
In practice, an elongate air blow part is provided in front of the bottom plate. The elongate air blow part has an elongate air blow slot with an opening facing vertically upward or obliquely upwards for blowing air jets vertically and upwards or in a direction towards the rear plate of the cabinet. A first air-supply space is formed between the left end of the elongate air blow part and the left lateral plate. A second air-supply space is formed between the right end of the elongate air blow part and the right lateral plate. The elongate air blow slot is parallel to the elongate air-extraction slot so as to form a nearly two-dimensional oblique air curtain between the elongate air-extraction part and the elongate air blow part during the air-extraction machine is in operation.
In practice, the exhaust device having deflection plates according to the present invention alternatively comprises a cabinet, a front and a rear left deflection plates, and a front and a rear right deflection plates. The cabinet includes an air-extraction hood, a bottom plate, a left lateral plate, and a right lateral plate, all of which define a space. An opening is respectively provided in front of and in back of the cabinet. An air-extraction part is provided at the bottom of the air-extraction hood. The air-extraction part has an elongate air-extraction slot facing downwards and the elongate air-extraction slot is perpendicular to the left and right lateral plates. The air-extraction part is connected with an air-extraction machine for drawing air upwards. The front and rear left deflection plates are respectively vertically located in the space in a manner of being relatively oblique to the left lateral plate, so as to form a first included angle between the front and the rear left deflection plates and the left lateral plate. The front right deflection plate is symmetrical to the front left deflection plate, while the rear right deflection plate is symmetrical to the rear left deflection plate. The front and the rear right deflection plates are respectively vertically located in the space in a manner of being relatively oblique to the right lateral plate, so as to form a second included angle between the front and the rear right deflection plates and the right lateral plate.
The following detailed description, given by way of examples or embodiments, will best be understood in conjunction with the accompanying drawings.
Please refer to
The cabinet 2 is in substantially rectangular or square shape. The lower part of the cabinet 2 is provided with a storage cabinet 29 for storage purpose. The storage cabinet 29 has legs and is able to support the cabinet 2. The cabinet 2 has an air-extraction hood 21, a bottom plate 22, a left lateral plate 23, a right lateral plate 24, and a rear plate 26. After being assembled together, above components define a space 27 within the cabinet 2. An opening 251 is provided below the front end of the air-extraction hood 21. Besides, a curved first guiding part 252 is provided at the bottom of the front end of the air-extraction hood 21, and a curved second guiding part 226 is provided at the top of the front end of the bottom plate 22. The front ends of the left lateral plate 23 and the right lateral plate 24 in the cabinet 2 are respectively provided with a curved first guiding plate 231 and a curved second guiding plate 241. Thereby, it is able to reduce the degree of turbulence and agitation produced when air is drawn into the opening 251. In implementation, the first guiding part 252, the second guiding part 226, the first guiding plate 231, and the second guiding plate 241 can be in a shape of a quarter arc of a circle or of a curved surface having a large curvature radius, both of which are capable of producing airflow-guiding effect.
The air-extraction hood 21 is provided with an air-extraction part 211 on its bottom. The air-extraction part 211 has an elongate air-extraction slot 212 facing downwards. The elongate air-extraction slot 212 is substantially rectangular. The elongate air-extraction slot 212 is lengthwise parallel to the rear plate 26. A plurality of air exhaust outlets 213 is provided on the top of the air-extraction hood 21. Each air exhaust outlet 213 is connected to an air collector 214 and the air collector 214 is connected with an air-extraction device 215. Thereby, when the air-extraction device 215 is in operation, the elongate air-extraction part 212 is capable of drawing in air and guiding the air in the cabinet 2 to flow upwards. In implementation, the air-extraction device 215 can be a drawing fan, air blower, or other fluid mechanisms capable of extracting air. Moreover, the bottom 216 of the air-extraction hood 21 is provided with a liquid barrier frame 217. The liquid barrier frame 217 protrudes upwards from the surface of the bottom plate 216 and surrounds the peripheries of the elongate air-extraction slot 212. A liquid collector 218 is provided below the rear end of the bottom plate 216 of the air-extraction hood 21. Alternatively, the liquid collector 218 also can be provided below the front end or the lateral end of the bottom plate 216.
In implementation, the air-extraction hood 21 also can be a substantially L-shape casing. As shown in
The left and right deflection plates 3, 4 are respectively a rectangular upright plate. The left deflection plate 3 is vertically located in the space 27 in a manner of being relatively oblique to the left lateral plate 23. Besides, the front end of the left deflection plate 3 is in a position closely against the right lateral surface of the left lateral plate 23, so as to form a first included angle θ1 between the left deflection plate 3 and the left lateral plate 23. The first included angle θ1 faces towards the rear plate 26. The right deflection plate 4 is symmetrical to the left deflection plate 3. Besides, the right deflection plate 4 is vertically located in the space 27 in a manner of being relatively oblique to the right lateral plate 24. Besides, the front end of the right deflection plate 4 is in a position closely against the left lateral surface of the right lateral plate 24, so as to form a second included angle θ2 between the right deflection plate 4 and the right lateral plate 24. The second included angle θ2 also faces towards the rear plate 26.
As shown in
Please refer to
By this way, as shown in
Please refer to
Moreover,
Therefore, the present invention has following advantages:
- 1. According to the present invention, the left and right deflection plates not only can be used to guide airflow to ensure air supply and to prevent the air entering the cabinet from flowing backwards, but they also can be used to guide effectively the airflow in the cabinet. Thereby, it is able to exhaust the pollutants or high-temperature soot effectively and to reduce the leakage of the pollutants.
- 2. According to the present invention, air can be smoothly guided by utilizing the first guiding plate, the second guiding plate, the first guiding part, and the second guiding part, so as to reduce the backflow occurring when the air is drawn into the opening. Thereby, it is able to prevent the pollutants or high-temperature soot from being carried out of the opening by the backflow.
As disclosed in the above description and attached drawings, the present invention can provide an exhaust device having deflection plates for reducing effectively the leakage of pollutants or high-temperature soot so as to ensure the safety in use. It is new and can be put into industrial use.
Although the embodiments of the present invention have been described in detail, many modifications and variations may be made by those skilled in the art from the teachings disclosed hereinabove. Therefore, it should be understood that any modification and variation equivalent to the spirit of the present invention be regarded to fall into the scope defined by the appended claims.
Claims
1. An exhaust device having deflection plates, comprising:
- a cabinet, having an air-extraction hood, a bottom plate, a left lateral plate, a right lateral plate, and a rear plate, all of which define a space, where an opening is provided in front of the cabinet; an air-extraction part is provided at a bottom of the air-extraction hood; the air-extraction part has an elongate air-extraction slot facing downwards; the elongate air-extraction slot is parallel to the rear plate; and the air-extraction part is connected with an air-extraction machine for drawing air upwards;
- a left deflection plate, vertically located in the space in a manner of being relatively oblique to the left lateral plate, so as to form a first included angle between the left deflection plate and the left lateral plate; and
- a right deflection plate, symmetrical to the left deflection plate and vertically located in the space in a manner of being relatively oblique to the right lateral plate, so as to form a second included angle between the right deflection plate and the right lateral plate.
2. The exhaust device having deflection plates as claimed in claim 1, wherein a front end of the bottom of the air-extraction hood is provided with a curved first guiding part while a top of the front end of the bottom plate is provided with a curved second guiding part.
3. The exhaust device having deflection plates as claimed in claim 1, wherein a front plate is further provided in front of the cabinet and the opening is formed below the front plate.
4. The exhaust device having deflection plates as claimed in claim 3, wherein an elongate air blow device is provided at the bottom of the front plate for blowing air downwards.
5. The exhaust device having deflection plates as claimed in claim 1, wherein an elongate air blow part is provided in front of the bottom plate; the elongate air blow part has an elongate air blow slot with an opening facing upwards; a first air-supply space is formed between the left end of the elongate air blow part and the left lateral plate; a second air-supply space is formed between the right end of the elongate air blow part and the right lateral plate; and the elongate air blow slot is parallel to the elongate air-extraction slot so as to form a nearly two-dimensional oblique air curtain between the elongate air-extraction part and the elongate air blow part during the air-extraction machine is in operation.
6. The exhaust device having deflection plates as claimed in claim 1, wherein a curved first guiding plate is provided at the front end of the left lateral plate the cabinet and a curved second guiding plate is provided at the front end of the right lateral plate of the cabinet for guiding airflow into the space.
7. The exhaust device having deflection plates as claimed in claim 1, wherein a front end of the left deflection plate is in a position closely against a right lateral surface of the left lateral plate; a front end of the right deflection plate is in a position closely against a left lateral surface of the right lateral plate; and the first and the second included angles face towards the rear plate.
8. The exhaust device having deflection plates as claimed in claim 7, wherein a front end of the bottom of the air-extraction hood is provided with a curved first guiding part while a top of the front end of the bottom plate is provided with a curved second guiding part.
9. The exhaust device having deflection plates as claimed in claim 7, wherein a front plate is further provided in front of the cabinet and the opening is formed below the front plate.
10. The exhaust device having deflection plates as claimed in claim 9, wherein an elongate air blow device is provided at the bottom of the front plate for blowing air downwards.
11. The exhaust device having deflection plates as claimed in claim 7, wherein an elongate air blow part is provided in front of the bottom plate; the elongate air blow part has an elongate air blow slot with an opening facing upwards; a first air-supply space is formed between the left end of the elongate air blow part and the left lateral plate; a second air-supply space is formed between the right end of the elongate air blow part and the right lateral plate; and the elongate air blow slot is parallel to the elongate air-extraction slot so as to form a nearly two-dimensional oblique air curtain between the elongate air-extraction part and the elongate air blow part during the air-extraction machine is in operation.
12. The exhaust device having deflection plates as claimed in claim 7, wherein a curved first guiding plate is provided at the front end of the left lateral plate the cabinet and a curved second guiding plate is provided at the front end of the right lateral plate of the cabinet for guiding airflow into the space.
13. An exhaust device having deflection plates, comprising:
- a cabinet, having an air-extraction hood, a bottom plate, a left lateral plate, and a right lateral plate, all of which define a space, where an opening is respectively provided in front of and in back of the cabinet; an air-extraction part is provided at the bottom of the air-extraction hood; the air-extraction part has an elongate air-extraction slot facing downwards; the elongate air-extraction slot is perpendicular to the left and right lateral plates; and the air-extraction part is connected with an air-extraction machine for drawing air upwards;
- a front and a rear left deflection plates, respectively vertically located in the space in a manner of being relatively oblique to the left lateral plate, so as to form a first included angle between the front and the rear left deflection plates and the left lateral plate; and
- a front and a rear right deflection plates, where the front right deflection plate is symmetrical to the front left deflection plate and the rear right deflection plate is symmetrical to the rear left deflection plate; and the front and the rear right deflection plates are respectively vertically located in the space in a manner of being relatively oblique to the right lateral plate, so as to form a second included angle between the front and the rear right deflection plates and the right lateral plate.
Type: Application
Filed: Apr 26, 2011
Publication Date: Nov 1, 2012
Inventor: Rong Fung HUANG (Taipei City)
Application Number: 13/094,503
International Classification: F24F 7/00 (20060101);